mondon-complexgenetic-2018.pdf (467.37 kB)
Complex genetic structure revealed in the circum-Antarctic broadcast spawning sea urchin Sterechinus neumayeri
journal contribution
posted on 2018-08-09, 00:00 authored by K J Miller, H P Baird, J Van Oosterom, Julie MondonJulie Mondon, C K KingPatterns and mechanisms of gene flow and larval dispersal in the Antarctic marine environment are still poorly understood, despite the current threat of rapid climate change and the need for such information to inform conservation and management efforts. Studies on Antarctic brooding marine invertebrates have demonstrated limited connectivity, concurrent with life history expectations; however, no equivalent data are available for broadcast spawning species for which we might expect a higher capacity for larval dispersal. Here, we have used microsatellite DNA markers and mitochondrial DNA sequence data to explore patterns of genetic structure and infer larval dispersal patterns across spatial scales of <500 m to 1400 km in the broadcast spawning sea urchin Sterechinus neumayeri. We show genetic differentiation at small spatial scales (<1 km), but genetic homogeneity over moderate (1−25 km) and large spatial scales (1000 km), consistent with patterns described as chaotic genetic patchiness. Self-recruitment appears common in S. neumayeri, and genotypes of larvae collected from the water column provide preliminary evidence that the adult population structure is maintained through variability among larval cohorts. Genetic similarity at large spatial scales may represent evolutionary connectivity on a circum-Antarctic scale, and likely also reflects a history of shelf recolonisation after isolation in glacial refugia.
History
Journal
Marine ecology progress seriesVolume
601Pagination
153 - 166Publisher
Inter-ResearchLocation
Oldendorf, GermanyPublisher DOI
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ISSN
0171-8630Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2018, The authorsUsage metrics
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Keywords
Gene flowLarval dispersalMigrationChaotic genetic patchinessMicrosatellitesEchinoidScience & TechnologyLife Sciences & BiomedicinePhysical SciencesEcologyMarine & Freshwater BiologyOceanographyEnvironmental Sciences & EcologyPARACENTROTUS-LIVIDUS ECHINODERMATASWEEPSTAKES REPRODUCTIVE SUCCESSMULTILOCUS GENOTYPE DATAPOPULATION-STRUCTURECONTRASTING PATTERNSMARINE POPULATIONSKIN AGGREGATIONPELAGIC LARVAESOUTHERN-OCEANZoologyOceanographyEcology
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